linux-kernel - Re: [PATCH v6] remoteproc: Add device awake calls in rproc boot and shutdown path

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Message-ID: <u326j22wteqtadni7wawvwbr6ai3h72iszwtfjwwbaztxj245c@5q4y7xlb3xnk>
Date: Wed, 18 Jun 2025 09:32:44 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>, 
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Mukesh Ojha <mukesh.ojha@....qualcomm.com>
Subject: Re: [PATCH v6] remoteproc: Add device awake calls in rproc boot and
 shutdown path

On Wed, Jun 18, 2025 at 03:14:41PM +0530, Souradeep Chowdhury wrote:
> Device awake calls are only present in the recovery path of remoteproc.

This is not the problem, this merely documents a related fact. Might be
worth mention after the problem has been established.

> If an user stops and starts rproc by using the sysfs interface, then on
> pm suspension the firmware fails to load as the request_firmware call
> under adsp_load relies on usermodehelper process which gets freezed on
> pm suspension.

I asked why is this a problem, what happens when the usermodehelper
processes gets frozen, why does this cause an issue for the starting
remoteproc?

Why does it cause issues during shutdown?

Regards,
Bjorn

> Add device awake calls in the rproc boot and shutdown path
> to fix this.
> 
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> Reviewed-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> ---
> Changes in v6
> 
> *Add some correction to commit message
> 
> Changes in v5
> 
> *Added more details to commit description
> 
> Changes in v4
> 
> *Remove stability from mailing list
> *Remove the extra tab in v3
> *Change the commit description
> 
>  drivers/remoteproc/remoteproc_core.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index c2cf0d277729..5d6c4e694b4c 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1917,6 +1917,7 @@ int rproc_boot(struct rproc *rproc)
>  		return -EINVAL;
>  	}
>  
> +	pm_stay_awake(rproc->dev.parent);
>  	dev = &rproc->dev;
>  
>  	ret = mutex_lock_interruptible(&rproc->lock);
> @@ -1961,6 +1962,7 @@ int rproc_boot(struct rproc *rproc)
>  		atomic_dec(&rproc->power);
>  unlock_mutex:
>  	mutex_unlock(&rproc->lock);
> +	pm_relax(rproc->dev.parent);
>  	return ret;
>  }
>  EXPORT_SYMBOL(rproc_boot);
> @@ -1991,6 +1993,7 @@ int rproc_shutdown(struct rproc *rproc)
>  	struct device *dev = &rproc->dev;
>  	int ret = 0;
>  
> +	pm_stay_awake(rproc->dev.parent);
>  	ret = mutex_lock_interruptible(&rproc->lock);
>  	if (ret) {
>  		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
> @@ -2027,6 +2030,7 @@ int rproc_shutdown(struct rproc *rproc)
>  	rproc->table_ptr = NULL;
>  out:
>  	mutex_unlock(&rproc->lock);
> +	pm_relax(rproc->dev.parent);
>  	return ret;
>  }
>  EXPORT_SYMBOL(rproc_shutdown);
> -- 
> 2.34.1
>